819989984 has 24 divisors (see below), whose sum is σ = 1761115608. Its totient is φ = 372722560.

The previous prime is 819989983. The next prime is 819989987. The reversal of 819989984 is 489989918.

It is a self number, because there is not a number n which added to its sum of digits gives 819989984.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (819989983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1164407 + ... + 1165110.

It is an arithmetic number, because the mean of its divisors is an integer number (73379817).

Almost surely, 2^819989984 is an apocalyptic number.

It is an amenable number.

819989984 is an abundant number, since it is smaller than the sum of its proper divisors (941125624).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

819989984 is a wasteful number, since it uses less digits than its factorization.

819989984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2329538 (or 2329530 counting only the distinct ones).

The product of its digits is 13436928, while the sum is 65.

The square root of 819989984 is about 28635.4672390726. The cubic root of 819989984 is about 935.9863513728.

The spelling of 819989984 in words is "eight hundred nineteen million, nine hundred eighty-nine thousand, nine hundred eighty-four".